Fabrtken



UNITED STATES PATENT OFFICE.

FRIEDRICH BAYER, OF ELBERFELD, GERMANY, ASSIGNOR TO THE FARBEN- FABRIKEN, VORMALS FRIEDR. BAYER CIE., OF SAME PLACE.

MANUFACTURE OF DYE-STUFFS AND COLORING-MATTER.

SPECIFICATION forming part of Letters Patent No. 363,502, dated May 24, 1887.

Application filed January 17, 1887. Serial No. 234,600.

To (LZZ whom it may concern:

Be it known that I, FRIEDRICH BAYER, a subject of the King of Prussia, residing at Elbert'eld, in the Empire of Germany, director of and assignor to the FARBENFABRIKEN,VOR- MALS FRIEDR. BAYER & 0113., have invented a new and useful Improvement in the Mannfacture of Dye Stuffs or Coloring-Matters, of which the following is a specification.

My invention relates to the production of a new bluish-red coloringmatter for dyeing cotton, wool, and silk by the action of the tetrazo compound of tolidinc on a new sulphonic acid of the beta-na 'ihthylamine, which I have called "betanaphthylaminc deltamonosulphonic acid.

1n carrying out my process to produce the new coloring-matter practically 1 proceed as follows: Fifty kilos of tolidine are converted in the well-known manner into the muriatic tetrazo compound. Asolution of the samein one thousand liters of water is poured into a solution containing seventy-three kilos beta,

tolidine and all other well-known sulpho acids of beta-naphthylarnine, and in particular the products of the betanaphthylamine-betamonosulphonic acid.

The dye-stuff thus obtained forms a brownred powder which is easily soluble in water, and dyes cotton, in a boiling alkaline or soap (N0 specimens.)

CH S)NH., 'With concentrated sulphuric acid the dyestutf described dissolves into a full blue color.

I do not in this application claim the process. u

described, having made a separate application therefor, which I have filed March 18, 1887,

What I claim as my invention, and desire to secure by Letters Patent, is

The bluish-red coloring-matter herein described, which has the following characteristics: It exists as a brownish-red powder easily soluble in water; dyes cotton a splendid bluishred in a boiling alkaline or soap bath, which color will not be altered by acetic acid; by adding muriatic acid to the aqueous solution the free acid of the dye-stud is formed; with concentrated sulphuric acid the dye-stuff described dissolves into a full blue color.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRIED. BAYER.

Witnesses: I

WM. A. POLLOOK, GEO. T. CURTIS, Jr. 

